At the Lean FRO, Kim Morrison, a Senior Research Software Engineer, recently ran an experiment that went well beyond our expectations. An AI agent converted zlib, a widely used C compression library embedded in countless systems, to Lean, with minimal human guidance. No special tooling was built. It was Claude, a general-purpose AI, with no special training for theorem proving, out of the box. The workflow had four steps. First, the AI produced a clean, readable Lean implementation of the zlib compression format, including the DEFLATE algorithm at its core. Second, the Lean version passed the library’s existing test suite, confirming behavioral equivalence. Third, key properties were stated and proved, not as tests, but as mathematical theorems. The capstone theorem:
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更重要的是，L系列（L7/L8/L9）处于大改款前夜，“定焦One”近期走访门店时注意到，销售人员称，现在是“清库存”式大促销。销售人员介绍L8机制时，直接亮出了一套组合拳：首先是4万元的现金直降，再叠加1万元的京牌置换，在此之上，部分区域（产地和交付地）还有共6000元的地区补贴。如果车主有旧车置换，还能再享受1.5万元的置换补贴，累计优惠在7万元以上。